Is This Earth’s Most Important Climate Mystery?

After a viral study inspired a campaign to plant 20 million trees, we went to see if they survived. In this episode of Weathered, we get into the surprising origins of the trillion tree campaign, how it nearly ended the careers of the scientists behind it, and what actually works when it comes to storing carbon and tackling climate change. Spoiler: it’s not just planting trees.

A mysterious patch in the Pacific Ocean is defying all climate models - it is inexplicably cooling while the rest of the world is warming. Stretching off the west coast of Ecuador, this “cold tongue” challenges what we know about fundamental ocean and atmospheric currents, and has big implications for weather systems throughout the world.

The 2025 LA Wildfires set a record as one of the most expensive and destructive in US history. As environmental shifts accelerate extreme fire conditions and communities expand into fire-prone landscapes, these devastating wildfires are becoming more common. But are they inevitable?